TY - GEN
T1 - Impact of DFE error propagation on FEC-based high-speed I/O links
AU - Narasimha, Rajan
AU - Warke, Nirmal
AU - Shanbhag, Naresh
PY - 2009
Y1 - 2009
N2 - Modern state-of-the-art I/O links today rely exclusively upon a high SNR channel and an equalization-based inner transceiver to achieve a BER of 10 -15. The equalizer typically consists of a transmit pre-emphasis driver for pre-cursor equalization and a receive DFE for post-cursor cancellation. Recently, forward error-correction (FEC) coding has been proposed to improve the BER and reduce power in high-speed I/O links. However, error-propagation in the DFE is a significant issue affecting code performance. The link performance is also tied to FEC implementation parameters like degree of parallelism. This paper presents a framework for analyzing the impact of DFE burst errors and implementation parameters on end-to-end link performance. For 10.3125Gb/s transmission through a channel with 19dB loss at Nyquist rate and serial FEC implementation, we find that a code rate r = 0.8 gives the best ISI penalty vs coding gain trade-off, and a codeword length of 750 bits is necessary to meet target performance. Further, it is observed that the performance of burst error correction codes does not necessarily improve with codeword length, i.e., there is an BER-optimal block length at a given code rate.
AB - Modern state-of-the-art I/O links today rely exclusively upon a high SNR channel and an equalization-based inner transceiver to achieve a BER of 10 -15. The equalizer typically consists of a transmit pre-emphasis driver for pre-cursor equalization and a receive DFE for post-cursor cancellation. Recently, forward error-correction (FEC) coding has been proposed to improve the BER and reduce power in high-speed I/O links. However, error-propagation in the DFE is a significant issue affecting code performance. The link performance is also tied to FEC implementation parameters like degree of parallelism. This paper presents a framework for analyzing the impact of DFE burst errors and implementation parameters on end-to-end link performance. For 10.3125Gb/s transmission through a channel with 19dB loss at Nyquist rate and serial FEC implementation, we find that a code rate r = 0.8 gives the best ISI penalty vs coding gain trade-off, and a codeword length of 750 bits is necessary to meet target performance. Further, it is observed that the performance of burst error correction codes does not necessarily improve with codeword length, i.e., there is an BER-optimal block length at a given code rate.
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U2 - 10.1109/GLOCOM.2009.5426027
DO - 10.1109/GLOCOM.2009.5426027
M3 - Conference contribution
AN - SCOPUS:77951574072
SN - 9781424441488
T3 - GLOBECOM - IEEE Global Telecommunications Conference
BT - GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference
T2 - 2009 IEEE Global Telecommunications Conference, GLOBECOM 2009
Y2 - 30 November 2009 through 4 December 2009
ER -